Risk: High
A flaw recently found in Opera versions 9.0 and 9.01 means that vulnerable versions of the browsers will crash when visiting maliciously constructed websites that contain overly long URLs (over 256 byes). Successful exploitation of this heap-based buffer overflow flaw creates a means for hackers to load malware onto PCs.
Opera recommends upgrading to version 9.02, which is available at:
http://www.opera.com/download/